2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 732
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions)provides an overview of each diagnostic category.
DTC Descriptor
DTC B3902 00
- Incorrect Immobilizer Identifier Received
Circuit/System Description
When certain modules are programmed and configured during installation, the module learns a specific environment identifier which is unique to
the vehicle. The environment identifier is used to prevent the swapping modules between vehicles. The body control module (BCM) is the keeper
of the environment identifier. The instrument cluster, electronic brake control module (EBCM), HVAC control module, sensing and diagnostic
module (SDM), engine control module (ECM), and steering column lock control module, if equipped, each learn the environment identifier during
their configuration process. During vehicle operation, each of these modules compare their environment identifier to that of the BCM. If the
identifiers match, vehicle starting is allowed. If an environment identifier does not match, vehicle starting is disabled.
Conditions for Running the DTC
Ignition is in the ACCESSORY or RUN position.
Conditions for Setting the DTC
The control module's environment identifier does not match the environment identifier stored by the BCM.
Action Taken When the DTC Sets
* The security indicator in the instrument cluster will illuminate.
* Vehicle starting will be disabled.
Conditions for Clearing the DTC
A current DTC will be cleared when the module learns a correct environment identifier.
Reference Information
Schematic Reference
Immobilizer Schematics (See: Accessories and Optional Equipment/Antitheft and Alarm Systems/Diagrams/Electrical Diagrams/Immobilizer
Schematics)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)
Description and Operation
Immobilizer Description and Operation (See: Accessories and Optional Equipment/Antitheft and Alarm Systems/Description and
Operation/Immobilizer)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning)for scan tool information
Circuit/System Verification
Perform the Programming and Setup procedure for the control module that set DTC B3902. Verify the DTC does not reset after programming.
